static public class SampleData{static public Publisher[] Publishers ={new Publisher {Name="FunBooks"},new Publisher {Name="Joe Publishing"},new Publisher {Name="I Publisher"}};static public Author[] Authors ={new Author {FirstName="Johnny", LastName="Good"},new Author {FirstName="Graziella", LastName="Simplegame"},new Author {FirstName="Octavio", LastName="Prince"},new Author {FirstName="Jeremy", LastName="Legrand"}};static public Subject[] Subjects ={new Subject {Name="Software development"},new Subject {Name="Novel"},new Subject {Name="Science fiction"}};static public Book[] Books ={new Book {Title="Funny Stories",Publisher=Publishers[0],Authors=new[]{Authors[0], Authors[1]},PageCount=101,Price=25.55M,PublicationDate=new DateTime(2004, 11, 10),Isbn="0-000-77777-2",Subject=Subjects[0]},new Book {Title="LINQ rules",Publisher=Publishers[1],Authors=new[]{Authors[2]},PageCount=300,Price=12M,PublicationDate=new DateTime(2007, 9, 2),Isbn="0-111-77777-2",Subject=Subjects[0]},new Book {Title="C# on Rails",Publisher=Publishers[1],Authors=new[]{Authors[2]},PageCount=256,Price=35.5M,PublicationDate=new DateTime(2007, 4, 1),Isbn="0-222-77777-2",Subject=Subjects[0]},new Book {Title="All your base are belong to us",Publisher=Publishers[1],Authors=new[]{Authors[3]},PageCount=1205,Price=35.5M,PublicationDate=new DateTime(2006, 5, 5),Isbn="0-333-77777-2",Subject=Subjects[2]},new Book {Title="Bonjour mon Amour",Publisher=Publishers[0],Authors=new[]{Authors[1], Authors[0]},PageCount=50,Price=29M,PublicationDate=new DateTime(1973, 2, 18),Isbn="2-444-77777-2",Subject=Subjects[1]}};}

    GridViewGroupJoin.DataSource =from publisher in SampleData.Publishersjoin book in SampleData.Books on publisher equals book.Publisher into publisherBooksselect new { Publisher=publisher.Name, Books=publisherBooks };GridViewGroupJoin.DataBind();

    var x = from book in SampleData.Booksgroup book by book.Publisherinto bookPublishersselect new { Publisher = bookPublishers.Key.Name, books = bookPublishers };

GridViewInnerJoin.DataSource =from publisher in SampleData.Publishersjoin book in SampleData.Books on publisher equals book.Publisherselect new { Publisher=publisher.Name, Book=book.Title };
GridViewInnerJoin.DataBind();

GridViewLeftOuterJoin.DataSource =from publisher in SampleData.Publishersjoin book in SampleData.Books on publisher equals book.Publisher into publisherBooksfrom book in publisherBooks.DefaultIfEmpty()select new {Publisher = publisher.Name,Book = book == default(Book) ? "(no books)" : book.Title};
GridViewLeftOuterJoin.DataBind();

GridViewCrossJoin.DataSource =from publisher in SampleData.Publishersfrom book in SampleData.Booksselect new {Correct = publisher == book.Publisher,Publisher = publisher.Name,Book = book.Title};
GridViewCrossJoin.DataBind();

SampleData.Publishers.SelectMany(publisher => SampleData.Books.Select(book => new{PublisherName = publisher.Name,BookName = book.Title}));